Since a combine harvester can nowadays cost more than a million, leasehold would be the answer and you can probablyput a Range Rover down as an agricultural vehicle. I know I have transported a couple of rams in the back of mine.
Many years ago I witnessed a combine catch fire in a barley field. The reactions were interesting.
Farmer rang the insurance company to check his cover and then chucked his mobile into the flames.
Driver ran quickly away as he had a box of shotgun cartridges under the seat.
Practical son fetched a Matbro to make a fire break.
Finally, son in law called the fire brigade.